The effect of high-frequency axial magnetic field (HFAMF) on the shape of the welding arc and welding formation of tungsten inert gas (TIG) welding is analyzed theoretically and experimentally. The 316L stainless steel plate was welded with HFAMF produced by the excitation coil installed on the welding torch. The influence of the HFAMF on the welding process is studied by changing the magnetic frequency from 0 to 2000 Hz. The experimental results show that when the magnetic field frequency reaches 1500 Hz, the arc rotation radius is decreased to the minimum; the arc shape changes from cone to compressed cylinder; and the arc temperature, the arc pressure, and the depth-width ratio of the weld beam reached the maximum. Otherwise, the effect of applied HFAMF on the stress of arc and weld pool is discussed, and the mechanism of arc contraction is analyzed.

从理论上和实验上分析了高频轴向磁场（HFAMF）对焊接电弧形状和惰性气体保护（TIG）焊缝形成的影响。316L不锈钢板与由安装在焊炬上的励磁线圈产生的HFAMF焊接。通过将磁频率从0更改为2000 Hz，研究了HFAMF对焊接过程的影响。实验结果表明，当磁场频率达到1500 Hz时，电弧旋转半径减小到最小。弧形从圆锥形变为压缩圆柱；电弧温度，电弧压力和焊接梁的深宽比达到最大值。否则，将讨论应用HFAMF对电弧和焊缝应力的影响，